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1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * ACPI 3.0 based NUMA setup
4  * Copyright 2004 Andi Kleen, SuSE Labs.
5  *
6  * Reads the ACPI SRAT table to figure out what memory belongs to which CPUs.
7  *
8  * Called from acpi_numa_init while reading the SRAT and SLIT tables.
9  * Assumes all memory regions belonging to a single proximity domain
10  * are in one chunk. Holes between them will be included in the node.
11  */
12
13 #include <linux/kernel.h>
14 #include <linux/acpi.h>
15 #include <linux/mmzone.h>
16 #include <linux/bitmap.h>
17 #include <linux/init.h>
18 #include <linux/topology.h>
19 #include <linux/mm.h>
20 #include <asm/proto.h>
21 #include <asm/numa.h>
22 #include <asm/e820/api.h>
23 #include <asm/apic.h>
24 #include <asm/uv/uv.h>
25
26 /* Callback for Proximity Domain -> x2APIC mapping */
27 void __init
28 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
29 {
30         int pxm, node;
31         int apic_id;
32
33         if (srat_disabled())
34                 return;
35         if (pa->header.length < sizeof(struct acpi_srat_x2apic_cpu_affinity)) {
36                 bad_srat();
37                 return;
38         }
39         if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
40                 return;
41         pxm = pa->proximity_domain;
42         apic_id = pa->apic_id;
43         if (!apic_id_valid(apic_id)) {
44                 pr_info("SRAT: PXM %u -> X2APIC 0x%04x ignored\n", pxm, apic_id);
45                 return;
46         }
47         node = acpi_map_pxm_to_node(pxm);
48         if (node < 0) {
49                 printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
50                 bad_srat();
51                 return;
52         }
53
54         if (apic_id >= MAX_LOCAL_APIC) {
55                 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
56                 return;
57         }
58         set_apicid_to_node(apic_id, node);
59         node_set(node, numa_nodes_parsed);
60         pr_debug("SRAT: PXM %u -> APIC 0x%04x -> Node %u\n", pxm, apic_id, node);
61 }
62
63 /* Callback for Proximity Domain -> LAPIC mapping */
64 void __init
65 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
66 {
67         int pxm, node;
68         int apic_id;
69
70         if (srat_disabled())
71                 return;
72         if (pa->header.length != sizeof(struct acpi_srat_cpu_affinity)) {
73                 bad_srat();
74                 return;
75         }
76         if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
77                 return;
78         pxm = pa->proximity_domain_lo;
79         if (acpi_srat_revision >= 2)
80                 pxm |= *((unsigned int*)pa->proximity_domain_hi) << 8;
81         node = acpi_map_pxm_to_node(pxm);
82         if (node < 0) {
83                 printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
84                 bad_srat();
85                 return;
86         }
87
88         if (get_uv_system_type() >= UV_X2APIC)
89                 apic_id = (pa->apic_id << 8) | pa->local_sapic_eid;
90         else
91                 apic_id = pa->apic_id;
92
93         if (apic_id >= MAX_LOCAL_APIC) {
94                 printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node);
95                 return;
96         }
97
98         set_apicid_to_node(apic_id, node);
99         node_set(node, numa_nodes_parsed);
100         pr_debug("SRAT: PXM %u -> APIC 0x%02x -> Node %u\n", pxm, apic_id, node);
101 }
102
103 int __init x86_acpi_numa_init(void)
104 {
105         int ret;
106
107         ret = acpi_numa_init();
108         if (ret < 0)
109                 return ret;
110         return srat_disabled() ? -EINVAL : 0;
111 }
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